21012222010121 has 16 divisors (see below), whose sum is σ = 21423153024000. Its totient is φ = 20604942765888.

The previous prime is 21012222010097. The next prime is 21012222010183. The reversal of 21012222010121 is 12101022221012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012222010121 is a prime.

It is a super-2 number, since 2×21012222010121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012222010121.

It is not an unprimeable number, because it can be changed into a prime (21012222010321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124770851 + ... + 124939143.

It is an arithmetic number, because the mean of its divisors is an integer number (1338947064000).

Almost surely, 2^{21012222010121} is an apocalyptic number.

It is an amenable number.

21012222010121 is a deficient number, since it is larger than the sum of its proper divisors (410931013879).

21012222010121 is a wasteful number, since it uses less digits than its factorization.

21012222010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179128.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012222010121 its reverse (12101022221012), we get a palindrome (33113244231133).

The spelling of 21012222010121 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, ten thousand, one hundred twenty-one".