2251221452644 has 24 divisors (see below), whose sum is σ = 4172432947200. Its totient is φ = 1059131150976.

The previous prime is 2251221452621. The next prime is 2251221452651. The reversal of 2251221452644 is 4462541221522.

It is a junction number, because it is equal to n+sod(n) for n = 2251221452597 and 2251221452606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3902944 + ... + 4442455.

It is an arithmetic number, because the mean of its divisors is an integer number (173851372800).

Almost surely, 2^{2251221452644} is an apocalyptic number.

It is an amenable number.

2251221452644 is a deficient number, since it is larger than the sum of its proper divisors (1921211494556).

2251221452644 is a wasteful number, since it uses less digits than its factorization.

2251221452644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349387 (or 8349385 counting only the distinct ones).

The product of its digits is 307200, while the sum is 40.

The spelling of 2251221452644 in words is "two trillion, two hundred fifty-one billion, two hundred twenty-one million, four hundred fifty-two thousand, six hundred forty-four".