21022001012 has 72 divisors (see below), whose sum is σ = 39617200896. Its totient is φ = 9741600000.

The previous prime is 21022000903. The next prime is 21022001029. The reversal of 21022001012 is 21010022012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21022000984 and 21022001002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27991637 + ... + 27992387.

Almost surely, 2^21022001012 is an apocalyptic number.

It is an amenable number.

21022001012 is a deficient number, since it is larger than the sum of its proper divisors (18595199884).

21022001012 is a wasteful number, since it uses less digits than its factorization.

21022001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21022001012 its reverse (21010022012), we get a palindrome (42032023024).

The spelling of 21022001012 in words is "twenty-one billion, twenty-two million, one thousand, twelve".