2415251621 has 2 divisors, whose sum is σ = 2415251622. Its totient is φ = 2415251620.

The previous prime is 2415251603. The next prime is 2415251639. The reversal of 2415251621 is 1261525142.

It is a balanced prime because it is at equal distance from previous prime (2415251603) and next prime (2415251639).

It can be written as a sum of positive squares in only one way, i.e., 2142671521 + 272580100 = 46289^2 + 16510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2415251621 - 2¹⁰ = 2415250597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2415251681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1207625810 + 1207625811.

It is an arithmetic number, because the mean of its divisors is an integer number (1207625811).

Almost surely, 2^2415251621 is an apocalyptic number.

It is an amenable number.

2415251621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2415251621 is an equidigital number, since it uses as much as digits as its factorization.

2415251621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 2415251621 is about 49145.2095427418. The cubic root of 2415251621 is about 1341.6960074307.

Adding to 2415251621 its reverse (1261525142), we get a palindrome (3676776763).

The spelling of 2415251621 in words is "two billion, four hundred fifteen million, two hundred fifty-one thousand, six hundred twenty-one".