249922147621 has 2 divisors, whose sum is σ = 249922147622. Its totient is φ = 249922147620.

The previous prime is 249922147487. The next prime is 249922147663. The reversal of 249922147621 is 126741229942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196879451521 + 53042696100 = 443711^2 + 230310^2 .

It is a cyclic number.

It is not a de Polignac number, because 249922147621 - 2¹⁷ = 249922016549 is a prime.

It is a super-2 number, since 2×249922147621² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249922187621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124961073810 + 124961073811.

It is an arithmetic number, because the mean of its divisors is an integer number (124961073811).

Almost surely, 2^249922147621 is an apocalyptic number.

It is an amenable number.

249922147621 is a deficient number, since it is larger than the sum of its proper divisors (1).

249922147621 is an equidigital number, since it uses as much as digits as its factorization.

249922147621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The spelling of 249922147621 in words is "two hundred forty-nine billion, nine hundred twenty-two million, one hundred forty-seven thousand, six hundred twenty-one".