21221000010124 has 12 divisors (see below), whose sum is σ = 37150695492624. Its totient is φ = 10606515583664.

The previous prime is 21221000010079. The next prime is 21221000010143. The reversal of 21221000010124 is 42101000012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221000010098 and 21221000010107.

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, 996093367 + ... + 996114670.

It is an arithmetic number, because the mean of its divisors is an integer number (3095891291052).

Almost surely, 2^{21221000010124} is an apocalyptic number.

It is an amenable number.

21221000010124 is a deficient number, since it is larger than the sum of its proper divisors (15929695482500).

21221000010124 is a wasteful number, since it uses less digits than its factorization.

21221000010124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992210704 (or 1992210702 counting only the distinct ones).

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

Adding to 21221000010124 its reverse (42101000012212), we get a palindrome (63322000022336).

The spelling of 21221000010124 in words is "twenty-one trillion, two hundred twenty-one billion, ten thousand, one hundred twenty-four".