21010021121210 has 16 divisors (see below), whose sum is σ = 41256041474592. Its totient is φ = 7640007680400.

The previous prime is 21010021121191. The next prime is 21010021121249. The reversal of 21010021121210 is 1212112001012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95500095896 + ... + 95500096115.

It is an arithmetic number, because the mean of its divisors is an integer number (2578502592162).

Almost surely, 2^{21010021121210} is an apocalyptic number.

21010021121210 is a deficient number, since it is larger than the sum of its proper divisors (20246020353382).

21010021121210 is a wasteful number, since it uses less digits than its factorization.

21010021121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191000192029.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21010021121210 its reverse (1212112001012), we get a palindrome (22222133122222).

The spelling of 21010021121210 in words is "twenty-one trillion, ten billion, twenty-one million, one hundred twenty-one thousand, two hundred ten".