51226620621 has 48 divisors (see below), whose sum is σ = 75906143040. Its totient is φ = 30704889600.

The previous prime is 51226620619. The next prime is 51226620649. The reversal of 51226620621 is 12602662215.

It is not a de Polignac number, because 51226620621 - 2¹ = 51226620619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51226620691) 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, 14176611 + ... + 14180223.

It is an arithmetic number, because the mean of its divisors is an integer number (1581377980).

Almost surely, 2^51226620621 is an apocalyptic number.

It is an amenable number.

51226620621 is a deficient number, since it is larger than the sum of its proper divisors (24679522419).

51226620621 is a wasteful number, since it uses less digits than its factorization.

51226620621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058 (or 4047 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 51226620621 in words is "fifty-one billion, two hundred twenty-six million, six hundred twenty thousand, six hundred twenty-one".