21377190 has 16 divisors (see below), whose sum is σ = 51305328. Its totient is φ = 5700576.

The previous prime is 21377183. The next prime is 21377201. The reversal of 21377190 is 9177312.

It is a super-2 number, since 2×21377190² = 913968504592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 712573 = 21377190 / (2 + 1 + 3 + 7 + 7 + 1 + 9 + 0).

It is a congruent number.

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, 356257 + ... + 356316.

It is an arithmetic number, because the mean of its divisors is an integer number (3206583).

Almost surely, 2^21377190 is an apocalyptic number.

21377190 is an abundant number, since it is smaller than the sum of its proper divisors (29928138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21377190 is a wasteful number, since it uses less digits than its factorization.

21377190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712583.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 21377190 is about 4623.5473394354. The cubic root of 21377190 is about 277.5344328672.

The spelling of 21377190 in words is "twenty-one million, three hundred seventy-seven thousand, one hundred ninety".