21011210121010 has 64 divisors (see below), whose sum is σ = 40113695059200. Its totient is φ = 7896520425472.

The previous prime is 21011210120987. The next prime is 21011210121079. The reversal of 21011210121010 is 1012101211012.

It is a happy number.

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, 356038386 + ... + 356097394.

It is an arithmetic number, because the mean of its divisors is an integer number (626776485300).

Almost surely, 2^{21011210121010} is an apocalyptic number.

21011210121010 is a deficient number, since it is larger than the sum of its proper divisors (19102484938190).

21011210121010 is a wasteful number, since it uses less digits than its factorization.

21011210121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62595.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21011210121010 its reverse (1012101211012), we get a palindrome (22023311332022).

The spelling of 21011210121010 in words is "twenty-one trillion, eleven billion, two hundred ten million, one hundred twenty-one thousand, ten".