21877130 has 32 divisors (see below), whose sum is σ = 45489600. Its totient is φ = 7486720.

The previous prime is 21877109. The next prime is 21877133. The reversal of 21877130 is 3177812.

It is a junction number, because it is equal to n+sod(n) for n = 21877093 and 21877102.

It is not an unprimeable number, because it can be changed into a prime (21877133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3980 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (1421550).

Almost surely, 2^21877130 is an apocalyptic number.

21877130 is an abundant number, since it is smaller than the sum of its proper divisors (23612470).

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

21877130 is a wasteful number, since it uses less digits than its factorization.

21877130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11734.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 21877130 is about 4677.2994345028. The cubic root of 21877130 is about 279.6813125874.

The spelling of 21877130 in words is "twenty-one million, eight hundred seventy-seven thousand, one hundred thirty".