21010992901 has 8 divisors (see below), whose sum is σ = 21581054240. Its totient is φ = 20441047248.

The previous prime is 21010992883. The next prime is 21010992907. The reversal of 21010992901 is 10929901012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010992901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010992907) 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, 441610 + ... + 486868.

It is an arithmetic number, because the mean of its divisors is an integer number (2697631780).

Almost surely, 2^21010992901 is an apocalyptic number.

It is an amenable number.

21010992901 is a deficient number, since it is larger than the sum of its proper divisors (570061339).

21010992901 is a wasteful number, since it uses less digits than its factorization.

21010992901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57843.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 21010992901 in words is "twenty-one billion, ten million, nine hundred ninety-two thousand, nine hundred one".