21423424623570 has 24 divisors (see below), whose sum is σ = 55700904021516. Its totient is φ = 5712913232928.

The previous prime is 21423424623547. The next prime is 21423424623593. The reversal of 21423424623570 is 7532642432412.

It is a happy number.

21423424623570 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 34 + 2 + 46 + 2 + 3 + 570 = 666.

It is an interprime number because it is at equal distance from previous prime (21423424623547) and next prime (21423424623593).

It can be written as a sum of positive squares in 2 ways, for example, as 17917501670649 + 3505922952921 = 4232907^2 + 1872411^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119019025597 + ... + 119019025776.

Almost surely, 2^{21423424623570} is an apocalyptic number.

21423424623570 is an abundant number, since it is smaller than the sum of its proper divisors (34277479397946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423424623570 is a wasteful number, since it uses less digits than its factorization.

21423424623570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238038051386 (or 238038051383 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 45.

The spelling of 21423424623570 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-four million, six hundred twenty-three thousand, five hundred seventy".