21429253012 has 6 divisors (see below), whose sum is σ = 37501192778. Its totient is φ = 10714626504.

The previous prime is 21429253009. The next prime is 21429253057. The reversal of 21429253012 is 21035292412.

It can be written as a sum of positive squares in only one way, i.e., 12096920196 + 9332332816 = 109986^2 + 96604^2 .

It is a super-2 number, since 2×21429253012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678656623 + ... + 2678656630.

Almost surely, 2^21429253012 is an apocalyptic number.

It is an amenable number.

21429253012 is a deficient number, since it is larger than the sum of its proper divisors (16071939766).

21429253012 is a wasteful number, since it uses less digits than its factorization.

21429253012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357313257 (or 5357313255 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21429253012 in words is "twenty-one billion, four hundred twenty-nine million, two hundred fifty-three thousand, twelve".