21667763770 has 16 divisors (see below), whose sum is σ = 39003732000. Its totient is φ = 8666715024.

The previous prime is 21667763749. The next prime is 21667763771. The reversal of 21667763770 is 7736776612.

It is a super-2 number, since 2×21667763770² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21667763771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309481 + ... + 372979.

It is an arithmetic number, because the mean of its divisors is an integer number (2437733250).

Almost surely, 2^21667763770 is an apocalyptic number.

21667763770 is a deficient number, since it is larger than the sum of its proper divisors (17335968230).

21667763770 is a wasteful number, since it uses less digits than its factorization.

21667763770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97629.

The product of its (nonzero) digits is 3111696, while the sum is 52.

The spelling of 21667763770 in words is "twenty-one billion, six hundred sixty-seven million, seven hundred sixty-three thousand, seven hundred seventy".