21426662412 has 36 divisors (see below), whose sum is σ = 56029493520. Its totient is φ = 6895936992.

The previous prime is 21426662381. The next prime is 21426662417.

21426662412 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21426662417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10260768 + ... + 10262855.

It is an arithmetic number, because the mean of its divisors is an integer number (1556374820).

Almost surely, 2^21426662412 is an apocalyptic number.

It is an amenable number.

21426662412 is an abundant number, since it is smaller than the sum of its proper divisors (34602831108).

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

21426662412 is a wasteful number, since it uses less digits than its factorization.

21426662412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523662 (or 20523657 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The spelling of 21426662412 in words is "twenty-one billion, four hundred twenty-six million, six hundred sixty-two thousand, four hundred twelve".