21087726045 has 16 divisors (see below), whose sum is σ = 33756245952. Its totient is φ = 11241492480.

The previous prime is 21087726031. The next prime is 21087726059. The reversal of 21087726045 is 54062778012.

It is an interprime number because it is at equal distance from previous prime (21087726031) and next prime (21087726059).

It is not a de Polignac number, because 21087726045 - 2⁵ = 21087726013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21087725988 and 21087726006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297892 + ... + 361821.

It is an arithmetic number, because the mean of its divisors is an integer number (2109765372).

Almost surely, 2^21087726045 is an apocalyptic number.

It is an amenable number.

21087726045 is a deficient number, since it is larger than the sum of its proper divisors (12668519907).

21087726045 is a wasteful number, since it uses less digits than its factorization.

21087726045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661852.

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 21087726045 in words is "twenty-one billion, eighty-seven million, seven hundred twenty-six thousand, forty-five".