21247660970 has 32 divisors (see below), whose sum is σ = 40602513600. Its totient is φ = 7977989376.

The previous prime is 21247660969. The next prime is 21247660979. The reversal of 21247660970 is 7906674212.

It is a super-2 number, since 2×21247660970² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21247660979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100460 + ... + 229319.

It is an arithmetic number, because the mean of its divisors is an integer number (1268828550).

Almost surely, 2^21247660970 is an apocalyptic number.

21247660970 is a deficient number, since it is larger than the sum of its proper divisors (19354852630).

21247660970 is a wasteful number, since it uses less digits than its factorization.

21247660970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330182.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21247660970 in words is "twenty-one billion, two hundred forty-seven million, six hundred sixty thousand, nine hundred seventy".