21201212021010 has 32 divisors (see below), whose sum is σ = 58151895829632. Its totient is φ = 4845991319040.

The previous prime is 21201212020987. The next prime is 21201212021123. The reversal of 21201212021010 is 1012021210212.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 50479076031 + ... + 50479076450.

It is an arithmetic number, because the mean of its divisors is an integer number (1817246744676).

Almost surely, 2^{21201212021010} is an apocalyptic number.

21201212021010 is an abundant number, since it is smaller than the sum of its proper divisors (36950683808622).

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

21201212021010 is a wasteful number, since it uses less digits than its factorization.

21201212021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100958152498.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201212021010 its reverse (1012021210212), we get a palindrome (22213233231222).

The spelling of 21201212021010 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, twenty-one thousand, ten".