21901852698 has 32 divisors (see below), whose sum is σ = 47795106240. Its totient is φ = 6635640960.

The previous prime is 21901852697. The next prime is 21901852723. The reversal of 21901852698 is 89625810912.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21901852698.

It is not an unprimeable number, because it can be changed into a prime (21901852697) 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, 344886 + ... + 403422.

It is an arithmetic number, because the mean of its divisors is an integer number (1493597070).

Almost surely, 2^21901852698 is an apocalyptic number.

21901852698 is an abundant number, since it is smaller than the sum of its proper divisors (25893253542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21901852698 is a wasteful number, since it uses less digits than its factorization.

21901852698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64222.

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 21901852698 in words is "twenty-one billion, nine hundred one million, eight hundred fifty-two thousand, six hundred ninety-eight".