21392470 has 32 divisors (see below), whose sum is σ = 42197760. Its totient is φ = 7743840.

The previous prime is 21392467. The next prime is 21392491. The reversal of 21392470 is 7429312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48069 + ... + 48511.

It is an arithmetic number, because the mean of its divisors is an integer number (1318680).

Almost surely, 2^21392470 is an apocalyptic number.

21392470 is a deficient number, since it is larger than the sum of its proper divisors (20805290).

21392470 is a wasteful number, since it uses less digits than its factorization.

21392470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21392470 is about 4625.1994551587. The cubic root of 21392470 is about 277.6005425248.

The spelling of 21392470 in words is "twenty-one million, three hundred ninety-two thousand, four hundred seventy".