21022021012 has 12 divisors (see below), whose sum is σ = 36790842816. Its totient is φ = 10510351640.

The previous prime is 21022021003. The next prime is 21022021037. The reversal of 21022021012 is 21012022012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21022020983 and 21022021001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89068 + ... + 223555.

It is an arithmetic number, because the mean of its divisors is an integer number (3065903568).

Almost surely, 2^21022021012 is an apocalyptic number.

It is an amenable number.

21022021012 is a deficient number, since it is larger than the sum of its proper divisors (15768821804).

21022021012 is a wasteful number, since it uses less digits than its factorization.

21022021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329438 (or 329436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022021012 its reverse (21012022012), we get a palindrome (42034043024).

The spelling of 21022021012 in words is "twenty-one billion, twenty-two million, twenty-one thousand, twelve".