21221012123002 has 4 divisors (see below), whose sum is σ = 31831518184506. Its totient is φ = 10610506061500.

The previous prime is 21221012122969. The next prime is 21221012123033. The reversal of 21221012123002 is 20032121012212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20891307631401 + 329704491601 = 4570701^2 + 574199^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305253030749 + ... + 5305253030752.

Almost surely, 2^{21221012123002} is an apocalyptic number.

21221012123002 is a deficient number, since it is larger than the sum of its proper divisors (10610506061504).

21221012123002 is a wasteful number, since it uses less digits than its factorization.

21221012123002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610506061503.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21221012123002 its reverse (20032121012212), we get a palindrome (41253133135214).

The spelling of 21221012123002 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred twenty-three thousand, two".