61421022 has 72 divisors (see below), whose sum is σ = 146908008. Its totient is φ = 18532800.

The previous prime is 61420991. The next prime is 61421023. The reversal of 61421022 is 22012416.

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

It is a junction number, because it is equal to n+sod(n) for n = 61420986 and 61421004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61421023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 185397 + ... + 185727.

It is an arithmetic number, because the mean of its divisors is an integer number (2040389).

Almost surely, 2^61421022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61421022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73454004).

61421022 is an abundant number, since it is smaller than the sum of its proper divisors (85486986).

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

61421022 is a wasteful number, since it uses less digits than its factorization.

61421022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 61421022 is about 7837.1564996496. The cubic root of 61421022 is about 394.5532994340.

Adding to 61421022 its reverse (22012416), we get a palindrome (83433438).

The spelling of 61421022 in words is "sixty-one million, four hundred twenty-one thousand, twenty-two".