21511770045 has 16 divisors (see below), whose sum is σ = 35151148800. Its totient is φ = 11228838464.

The previous prime is 21511770023. The next prime is 21511770149. The reversal of 21511770045 is 54007711512.

It is a cyclic number.

It is not a de Polignac number, because 21511770045 - 2¹⁰ = 21511769021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21511769988 and 21511770015.

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, 15255870 + ... + 15257279.

It is an arithmetic number, because the mean of its divisors is an integer number (2196946800).

Almost surely, 2^21511770045 is an apocalyptic number.

It is an amenable number.

21511770045 is a deficient number, since it is larger than the sum of its proper divisors (13639378755).

21511770045 is a wasteful number, since it uses less digits than its factorization.

21511770045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30513204.

The product of its (nonzero) digits is 9800, while the sum is 33.

The spelling of 21511770045 in words is "twenty-one billion, five hundred eleven million, seven hundred seventy thousand, forty-five".