57621421 has 8 divisors (see below), whose sum is σ = 67695264. Its totient is φ = 48353520.

The previous prime is 57621401. The next prime is 57621427. The reversal of 57621421 is 12412675.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57621421 - 2²¹ = 55524269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57621421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57621427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201331 + ... + 201616.

It is an arithmetic number, because the mean of its divisors is an integer number (8461908).

Almost surely, 2^57621421 is an apocalyptic number.

It is an amenable number.

57621421 is a deficient number, since it is larger than the sum of its proper divisors (10073843).

57621421 is a wasteful number, since it uses less digits than its factorization.

57621421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402971.

The product of its digits is 3360, while the sum is 28.

The square root of 57621421 is about 7590.8774855085. The cubic root of 57621421 is about 386.2436223257.

The spelling of 57621421 in words is "fifty-seven million, six hundred twenty-one thousand, four hundred twenty-one".