1021210120 has 64 divisors (see below), whose sum is σ = 2740158720. Its totient is φ = 334904064.

The previous prime is 1021210103. The next prime is 1021210133. The reversal of 1021210120 is 210121201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1021210097 and 1021210106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72847 + ... + 85726.

It is an arithmetic number, because the mean of its divisors is an integer number (42814980).

Almost surely, 2^1021210120 is an apocalyptic number.

1021210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021210120 is an abundant number, since it is smaller than the sum of its proper divisors (1718948600).

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

1021210120 is a wasteful number, since it uses less digits than its factorization.

1021210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158614 (or 158610 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1021210120 is about 31956.3783930532. The cubic root of 1021210120 is about 1007.0206353321.

Adding to 1021210120 its reverse (210121201), we get a palindrome (1231331321).

The spelling of 1021210120 in words is "one billion, twenty-one million, two hundred ten thousand, one hundred twenty".