21001121012010 has 64 divisors (see below), whose sum is σ = 54608660548992. Its totient is φ = 5148291219456.

The previous prime is 21001121011991. The next prime is 21001121012017. The reversal of 21001121012010 is 1021012110012.

It is a super-2 number, since 2×21001121012010² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21001121012017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478799799 + ... + 478843658.

It is an arithmetic number, because the mean of its divisors is an integer number (853260321078).

Almost surely, 2^{21001121012010} is an apocalyptic number.

21001121012010 is an abundant number, since it is smaller than the sum of its proper divisors (33607539536982).

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

21001121012010 is a wasteful number, since it uses less digits than its factorization.

21001121012010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957643527.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001121012010 its reverse (1021012110012), we get a palindrome (22022133122022).

The spelling of 21001121012010 in words is "twenty-one trillion, one billion, one hundred twenty-one million, twelve thousand, ten".