210212021520 has 120 divisors (see below), whose sum is σ = 711351381312. Its totient is φ = 55628601600.

The previous prime is 210212021491. The next prime is 210212021563. The reversal of 210212021520 is 25120212012.

210212021520 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 120 + 21 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×210212021520² (a number of 23 digits) contains 22 as substring.

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 = 210212021493 and 210212021502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1020036 + ... + 1208675.

Almost surely, 2^210212021520 is an apocalyptic number.

210212021520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210212021520 is an abundant number, since it is smaller than the sum of its proper divisors (501139359792).

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

210212021520 is a wasteful number, since it uses less digits than its factorization.

210212021520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228861 (or 2228852 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 210212021520 its reverse (25120212012), we get a palindrome (235332233532).

The spelling of 210212021520 in words is "two hundred ten billion, two hundred twelve million, twenty-one thousand, five hundred twenty".