21770457951 has 16 divisors (see below), whose sum is σ = 32339870208. Its totient is φ = 12913488000.

The previous prime is 21770457949. The next prime is 21770457953. The reversal of 21770457951 is 15975407712.

It is an interprime number because it is at equal distance from previous prime (21770457949) and next prime (21770457953).

It is not a de Polignac number, because 21770457951 - 2¹ = 21770457949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21770457951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770457953) 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, 7016650 + ... + 7019751.

It is an arithmetic number, because the mean of its divisors is an integer number (2021241888).

Almost surely, 2^21770457951 is an apocalyptic number.

21770457951 is a deficient number, since it is larger than the sum of its proper divisors (10569412257).

21770457951 is a wasteful number, since it uses less digits than its factorization.

21770457951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14036462.

The product of its (nonzero) digits is 617400, while the sum is 48.

The spelling of 21770457951 in words is "twenty-one billion, seven hundred seventy million, four hundred fifty-seven thousand, nine hundred fifty-one".