21970650625 has 125 divisors (see below), whose sum is σ = 35230992005. Its totient is φ = 13695990000.

The previous prime is 21970650601. The next prime is 21970650649. The reversal of 21970650625 is 52605607912.

The square root of 21970650625 is 148225.

It is a perfect power (a square, a biquadrate), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (21970650601) and next prime (21970650649).

It can be written as a sum of positive squares in 2 ways, for example, as 1722499009 + 20248151616 = 41503^2 + 142296^2 .

It is a tau number, because it is divible by the number of its divisors (125).

It is not a de Polignac number, because 21970650625 - 2⁹ = 21970650113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 124 ways as a sum of consecutive naturals, for example, 1997331870 + ... + 1997331880.

Almost surely, 2^21970650625 is an apocalyptic number.

21970650625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21970650625 is the 148225-th square number.

21970650625 is the 74113-rd centered octagonal number.

It is an amenable number.

21970650625 is a deficient number, since it is larger than the sum of its proper divisors (13260341380).

21970650625 is an frugal number, since it uses more digits than its factorization.

21970650625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 21970650625 in words is "twenty-one billion, nine hundred seventy million, six hundred fifty thousand, six hundred twenty-five".