21025070 has 16 divisors (see below), whose sum is σ = 41285808. Its totient is φ = 7645440.

The previous prime is 21025051. The next prime is 21025091. The reversal of 21025070 is 7052012.

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, 95459 + ... + 95678.

It is an arithmetic number, because the mean of its divisors is an integer number (2580363).

Almost surely, 2^21025070 is an apocalyptic number.

21025070 is a deficient number, since it is larger than the sum of its proper divisors (20260738).

21025070 is a wasteful number, since it uses less digits than its factorization.

21025070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191155.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 21025070 is about 4585.3102403218. The cubic root of 21025070 is about 276.0021616438.

Adding to 21025070 its reverse (7052012), we get a palindrome (28077082).

The spelling of 21025070 in words is "twenty-one million, twenty-five thousand, seventy".