21041666690 has 32 divisors (see below), whose sum is σ = 41443081920. Its totient is φ = 7628385600.

The previous prime is 21041666689. The next prime is 21041666693. The reversal of 21041666690 is 9666614012.

It is a super-2 number, since 2×21041666690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21041666693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252545 + ... + 325364.

It is an arithmetic number, because the mean of its divisors is an integer number (1295096310).

Almost surely, 2^21041666690 is an apocalyptic number.

21041666690 is a deficient number, since it is larger than the sum of its proper divisors (20401415230).

21041666690 is a wasteful number, since it uses less digits than its factorization.

21041666690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578258.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 21041666690 in words is "twenty-one billion, forty-one million, six hundred sixty-six thousand, six hundred ninety".