21121624766 has 32 divisors (see below), whose sum is σ = 35538069600. Its totient is φ = 9333118080.

The previous prime is 21121624747. The next prime is 21121624801. The reversal of 21121624766 is 66742612112.

It is a happy number.

It is a super-2 number, since 2×21121624766² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44000 + ... + 210188.

It is an arithmetic number, because the mean of its divisors is an integer number (1110564675).

Almost surely, 2^21121624766 is an apocalyptic number.

21121624766 is a deficient number, since it is larger than the sum of its proper divisors (14416444834).

21121624766 is a wasteful number, since it uses less digits than its factorization.

21121624766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166364.

The product of its digits is 48384, while the sum is 38.

The spelling of 21121624766 in words is "twenty-one billion, one hundred twenty-one million, six hundred twenty-four thousand, seven hundred sixty-six".