21000021102010 has 64 divisors (see below), whose sum is σ = 39539509581600. Its totient is φ = 8020117504000.

The previous prime is 21000021102007. The next prime is 21000021102077. The reversal of 21000021102010 is 1020112000012.

It can be written as a sum of positive squares in 16 ways, for example, as 4998189049569 + 16001832052441 = 2235663^2 + 4000229^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23252490 + ... + 24138730.

Almost surely, 2^{21000021102010} is an apocalyptic number.

21000021102010 is a deficient number, since it is larger than the sum of its proper divisors (18539488479590).

21000021102010 is a wasteful number, since it uses less digits than its factorization.

21000021102010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887187.

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

Adding to 21000021102010 its reverse (1020112000012), we get a palindrome (22020133102022).

The spelling of 21000021102010 in words is "twenty-one trillion, twenty-one million, one hundred two thousand, ten".