21020122001212 has 24 divisors (see below), whose sum is σ = 37975708979712. Its totient is φ = 10169988644400.

The previous prime is 21020122001143. The next prime is 21020122001237. The reversal of 21020122001212 is 21210022102012.

It is a happy number.

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, 7430614 + ... + 9861757.

It is an arithmetic number, because the mean of its divisors is an integer number (1582321207488).

Almost surely, 2^{21020122001212} is an apocalyptic number.

It is an amenable number.

21020122001212 is a deficient number, since it is larger than the sum of its proper divisors (16955586978500).

21020122001212 is a wasteful number, since it uses less digits than its factorization.

21020122001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17302209 (or 17302207 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020122001212 its reverse (21210022102012), we get a palindrome (42230144103224).

The spelling of 21020122001212 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, one thousand, two hundred twelve".