21201021010 has 64 divisors (see below), whose sum is σ = 42738554880. Its totient is φ = 7518309120.

The previous prime is 21201021007. The next prime is 21201021031. The reversal of 21201021010 is 1012010212.

It is a super-2 number, since 2×21201021010² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 705349 + ... + 734791.

It is an arithmetic number, because the mean of its divisors is an integer number (667789920).

Almost surely, 2^21201021010 is an apocalyptic number.

21201021010 is an abundant number, since it is smaller than the sum of its proper divisors (21537533870).

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

21201021010 is a wasteful number, since it uses less digits than its factorization.

21201021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29683.

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

Adding to 21201021010 its reverse (1012010212), we get a palindrome (22213031222).

The spelling of 21201021010 in words is "twenty-one billion, two hundred one million, twenty-one thousand, ten".