21533204214 has 16 divisors (see below), whose sum is σ = 47851565040. Its totient is φ = 7177734720.

The previous prime is 21533204191. The next prime is 21533204237. The reversal of 21533204214 is 41240233512.

21533204214 is a `hidden beast` number, since 215 + 3 + 3 + 20 + 421 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21533204191) and next prime (21533204237).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199381467 + ... + 199381574.

It is an arithmetic number, because the mean of its divisors is an integer number (2990722815).

Almost surely, 2^21533204214 is an apocalyptic number.

21533204214 is an abundant number, since it is smaller than the sum of its proper divisors (26318360826).

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

21533204214 is a wasteful number, since it uses less digits than its factorization.

21533204214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398763052 (or 398763046 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21533204214 its reverse (41240233512), we get a palindrome (62773437726).

The spelling of 21533204214 in words is "twenty-one billion, five hundred thirty-three million, two hundred four thousand, two hundred fourteen".