71421012 has 144 divisors (see below), whose sum is σ = 211341312. Its totient is φ = 20136960.

The previous prime is 71421011. The next prime is 71421013. The reversal of 71421012 is 21012417.

It is an interprime number because it is at equal distance from previous prime (71421011) and next prime (71421013).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71421011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373837 + ... + 374027.

It is an arithmetic number, because the mean of its divisors is an integer number (1467648).

Almost surely, 2^71421012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71421012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105670656).

71421012 is an abundant number, since it is smaller than the sum of its proper divisors (139920300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71421012 is a wasteful number, since it uses less digits than its factorization.

71421012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 71421012 is about 8451.0953136265. The cubic root of 71421012 is about 414.8986291331.

Adding to 71421012 its reverse (21012417), we get a palindrome (92433429).

The spelling of 71421012 in words is "seventy-one million, four hundred twenty-one thousand, twelve".