21890402837 has 8 divisors (see below), whose sum is σ = 22598272512. Its totient is φ = 21182641200.

The previous prime is 21890402813. The next prime is 21890402839. The reversal of 21890402837 is 73820409812.

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

It is a cyclic number.

It is not a de Polignac number, because 21890402837 - 2⁸ = 21890402581 is a prime.

It is a super-2 number, since 2×21890402837² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21890402839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673787 + ... + 705527.

It is an arithmetic number, because the mean of its divisors is an integer number (2824784064).

Almost surely, 2^21890402837 is an apocalyptic number.

It is an amenable number.

21890402837 is a deficient number, since it is larger than the sum of its proper divisors (707869675).

21890402837 is a wasteful number, since it uses less digits than its factorization.

21890402837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54019.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 21890402837 in words is "twenty-one billion, eight hundred ninety million, four hundred two thousand, eight hundred thirty-seven".