21301970 has 16 divisors (see below), whose sum is σ = 38401560. Its totient is φ = 8507904.

The previous prime is 21301967. The next prime is 21301997. The reversal of 21301970 is 7910312.

It can be written as a sum of positive squares in 4 ways, for example, as 8334769 + 12967201 = 2887^2 + 3601^2 .

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, 8144 + ... + 10436.

Almost surely, 2^21301970 is an apocalyptic number.

21301970 is a deficient number, since it is larger than the sum of its proper divisors (17099590).

21301970 is a wasteful number, since it uses less digits than its factorization.

21301970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21301970 is about 4615.4057243107. The cubic root of 21301970 is about 277.2085298264.

The spelling of 21301970 in words is "twenty-one million, three hundred one thousand, nine hundred seventy".