19472218251 has 16 divisors (see below), whose sum is σ = 27493006464. Its totient is φ = 12216610944.

The previous prime is 19472218243. The next prime is 19472218261. The reversal of 19472218251 is 15281227491.

It is not a de Polignac number, because 19472218251 - 2³ = 19472218243 is a prime.

It is a super-2 number, since 2×19472218251² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19472218211) 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, 947976 + ... + 968298.

It is an arithmetic number, because the mean of its divisors is an integer number (1718312904).

Almost surely, 2^19472218251 is an apocalyptic number.

19472218251 is a deficient number, since it is larger than the sum of its proper divisors (8020788213).

19472218251 is a wasteful number, since it uses less digits than its factorization.

19472218251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39130.

The product of its digits is 80640, while the sum is 42.

The spelling of 19472218251 in words is "nineteen billion, four hundred seventy-two million, two hundred eighteen thousand, two hundred fifty-one".