21534070 has 32 divisors (see below), whose sum is σ = 41313888. Its totient is φ = 8053248.

The previous prime is 21534067. The next prime is 21534083. The reversal of 21534070 is 7043512.

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, 33169 + ... + 33811.

It is an arithmetic number, because the mean of its divisors is an integer number (1291059).

Almost surely, 2^21534070 is an apocalyptic number.

21534070 is a deficient number, since it is larger than the sum of its proper divisors (19779818).

21534070 is a wasteful number, since it uses less digits than its factorization.

21534070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21534070 is about 4640.4816560353. The cubic root of 21534070 is about 278.2116894267.

Adding to 21534070 its reverse (7043512), we get a palindrome (28577582).

The spelling of 21534070 in words is "twenty-one million, five hundred thirty-four thousand, seventy".