21022031012 has 6 divisors (see below), whose sum is σ = 36788554278. Its totient is φ = 10511015504.

The previous prime is 21022030979. The next prime is 21022031029. The reversal of 21022031012 is 21013022012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15184154176 + 5837876836 = 123224^2 + 76406^2 .

It is a super-3 number, since 3×21022031012³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627753873 + ... + 2627753880.

It is an arithmetic number, because the mean of its divisors is an integer number (6131425713).

Almost surely, 2^21022031012 is an apocalyptic number.

It is an amenable number.

21022031012 is a deficient number, since it is larger than the sum of its proper divisors (15766523266).

21022031012 is a wasteful number, since it uses less digits than its factorization.

21022031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255507757 (or 5255507755 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21022031012 its reverse (21013022012), we get a palindrome (42035053024).

The spelling of 21022031012 in words is "twenty-one billion, twenty-two million, thirty-one thousand, twelve".