21367197370 has 16 divisors (see below), whose sum is σ = 38620548648. Its totient is φ = 8511413760.

The previous prime is 21367197359. The next prime is 21367197391. The reversal of 21367197370 is 7379176312.

It can be written as a sum of positive squares in 4 ways, for example, as 19449370521 + 1917826849 = 139461^2 + 43793^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21367197370.

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, 4430619 + ... + 4435438.

Almost surely, 2^21367197370 is an apocalyptic number.

21367197370 is a deficient number, since it is larger than the sum of its proper divisors (17253351278).

21367197370 is a wasteful number, since it uses less digits than its factorization.

21367197370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8866305.

The product of its (nonzero) digits is 333396, while the sum is 46.

The spelling of 21367197370 in words is "twenty-one billion, three hundred sixty-seven million, one hundred ninety-seven thousand, three hundred seventy".