21235021452 has 96 divisors (see below), whose sum is σ = 59820902400. Its totient is φ = 6489460800.

The previous prime is 21235021427. The next prime is 21235021477. The reversal of 21235021452 is 25412053212.

21235021452 is a `hidden beast` number, since 2 + 12 + 3 + 502 + 145 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21235021427) and next prime (21235021477).

It is a super-2 number, since 2×21235021452² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103299 + ... + 230522.

It is an arithmetic number, because the mean of its divisors is an integer number (623134400).

Almost surely, 2^21235021452 is an apocalyptic number.

It is an amenable number.

21235021452 is an abundant number, since it is smaller than the sum of its proper divisors (38585880948).

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

21235021452 is a wasteful number, since it uses less digits than its factorization.

21235021452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333884 (or 333876 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21235021452 its reverse (25412053212), we get a palindrome (46647074664).

The spelling of 21235021452 in words is "twenty-one billion, two hundred thirty-five million, twenty-one thousand, four hundred fifty-two".