21014164552 has 8 divisors (see below), whose sum is σ = 39401558550. Its totient is φ = 10507082272.

The previous prime is 21014164547. The next prime is 21014164553. The reversal of 21014164552 is 25546141012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20651414436 + 362750116 = 143706^2 + 19046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21014164552² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21014164553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313385277 + ... + 1313385292.

Almost surely, 2^21014164552 is an apocalyptic number.

It is an amenable number.

21014164552 is a deficient number, since it is larger than the sum of its proper divisors (18387393998).

21014164552 is a wasteful number, since it uses less digits than its factorization.

21014164552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626770575 (or 2626770571 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 21014164552 in words is "twenty-one billion, fourteen million, one hundred sixty-four thousand, five hundred fifty-two".