221026456651 has 48 divisors (see below), whose sum is σ = 300118411264. Its totient is φ = 158391288000.

The previous prime is 221026456621. The next prime is 221026456681. The reversal of 221026456651 is 156654620122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221026456621) and next prime (221026456681).

It is not a de Polignac number, because 221026456651 - 2⁷ = 221026456523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221026456601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2946946 + ... + 3021016.

Almost surely, 2^221026456651 is an apocalyptic number.

221026456651 is a deficient number, since it is larger than the sum of its proper divisors (79091954613).

221026456651 is a wasteful number, since it uses less digits than its factorization.

221026456651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74384 (or 74373 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 221026456651 in words is "two hundred twenty-one billion, twenty-six million, four hundred fifty-six thousand, six hundred fifty-one".