21429428227624 has 16 divisors (see below), whose sum is σ = 40254448134420. Its totient is φ = 10694908725120.

The previous prime is 21429428227619. The next prime is 21429428227667. The reversal of 21429428227624 is 42672282492412.

It can be written as a sum of positive squares in 2 ways, for example, as 21237074056900 + 192354170724 = 4608370^2 + 438582^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2475668989 + ... + 2475677644.

Almost surely, 2^{21429428227624} is an apocalyptic number.

It is an amenable number.

21429428227624 is a deficient number, since it is larger than the sum of its proper divisors (18825019906796).

21429428227624 is a wasteful number, since it uses less digits than its factorization.

21429428227624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4951347180 (or 4951347176 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 55.

The spelling of 21429428227624 in words is "twenty-one trillion, four hundred twenty-nine billion, four hundred twenty-eight million, two hundred twenty-seven thousand, six hundred twenty-four".