21434925690 has 48 divisors (see below), whose sum is σ = 55857859200. Its totient is φ = 5702949216.

The previous prime is 21434925661. The next prime is 21434925691. The reversal of 21434925690 is 9652943412.

21434925690 is a `hidden beast` number, since 2 + 1 + 43 + 49 + 2 + 569 + 0 = 666.

It is a super-2 number, since 2×21434925690² (a number of 21 digits) contains 22 as substring.

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

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21434925691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231750 + ... + 310769.

It is an arithmetic number, because the mean of its divisors is an integer number (1163705400).

Almost surely, 2^21434925690 is an apocalyptic number.

21434925690 is an abundant number, since it is smaller than the sum of its proper divisors (34422933510).

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

21434925690 is a wasteful number, since it uses less digits than its factorization.

21434925690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542971 (or 542968 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 21434925690 in words is "twenty-one billion, four hundred thirty-four million, nine hundred twenty-five thousand, six hundred ninety".