21214123452 has 48 divisors (see below), whose sum is σ = 55513624320. Its totient is φ = 7005283056.

The previous prime is 21214123433. The next prime is 21214123477. The reversal of 21214123452 is 25432141212.

21214123452 is a `hidden beast` number, since 212 + 1 + 412 + 34 + 5 + 2 = 666.

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

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906328 + ... + 929439.

It is an arithmetic number, because the mean of its divisors is an integer number (1156533840).

Almost surely, 2^21214123452 is an apocalyptic number.

It is an amenable number.

21214123452 is an abundant number, since it is smaller than the sum of its proper divisors (34299500868).

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

21214123452 is a wasteful number, since it uses less digits than its factorization.

21214123452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835887 (or 1835879 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

Adding to 21214123452 its reverse (25432141212), we get a palindrome (46646264664).

The spelling of 21214123452 in words is "twenty-one billion, two hundred fourteen million, one hundred twenty-three thousand, four hundred fifty-two".