221701669425 has 36 divisors (see below), whose sum is σ = 398385907920. Its totient is φ = 117855704160.

The previous prime is 221701669393. The next prime is 221701669439. The reversal of 221701669425 is 524966107122.

221701669425 is a `hidden beast` number, since 2 + 217 + 0 + 1 + 6 + 6 + 9 + 425 = 666.

It is not a de Polignac number, because 221701669425 - 2⁵ = 221701669393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1535715 + ... + 1673864.

It is an arithmetic number, because the mean of its divisors is an integer number (11066275220).

Almost surely, 2^221701669425 is an apocalyptic number.

221701669425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221701669425 is a deficient number, since it is larger than the sum of its proper divisors (176684238495).

221701669425 is a wasteful number, since it uses less digits than its factorization.

221701669425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3209902 (or 3209894 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 221701669425 in words is "two hundred twenty-one billion, seven hundred one million, six hundred sixty-nine thousand, four hundred twenty-five".