21020022121312 has 48 divisors (see below), whose sum is σ = 41906675365632. Its totient is φ = 10377890524800.

The previous prime is 21020022121237. The next prime is 21020022121321. The reversal of 21020022121312 is 21312122002012.

It is a self number, because there is not a number n which added to its sum of digits gives 21020022121312.

It is a congruent number.

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, 12217518 + ... + 13831405.

It is an arithmetic number, because the mean of its divisors is an integer number (873055736784).

Almost surely, 2^{21020022121312} is an apocalyptic number.

It is an amenable number.

21020022121312 is a deficient number, since it is larger than the sum of its proper divisors (20886653244320).

21020022121312 is a wasteful number, since it uses less digits than its factorization.

21020022121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26049251 (or 26049243 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21020022121312 its reverse (21312122002012), we get a palindrome (42332144123324).

The spelling of 21020022121312 in words is "twenty-one trillion, twenty billion, twenty-two million, one hundred twenty-one thousand, three hundred twelve".