21421046652 has 24 divisors (see below), whose sum is σ = 52613097600. Its totient is φ = 6764540976.

The previous prime is 21421046641. The next prime is 21421046653. The reversal of 21421046652 is 25664012412.

It is a super-2 number, since 2×21421046652² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421046653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46975752 + ... + 46976207.

It is an arithmetic number, because the mean of its divisors is an integer number (2192212400).

Almost surely, 2^21421046652 is an apocalyptic number.

It is an amenable number.

21421046652 is an abundant number, since it is smaller than the sum of its proper divisors (31192050948).

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

21421046652 is a wasteful number, since it uses less digits than its factorization.

21421046652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93951985 (or 93951983 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21421046652 in words is "twenty-one billion, four hundred twenty-one million, forty-six thousand, six hundred fifty-two".