21531424154211 has 6 divisors (see below), whose sum is σ = 31100946000540. Its totient is φ = 14354282769468.

The previous prime is 21531424154197. The next prime is 21531424154257. The reversal of 21531424154211 is 11245142413512.

21531424154211 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 1 + 424 + 15 + 4 + 211 = 666.

It is not a de Polignac number, because 21531424154211 - 2³⁸ = 21256546247267 is a prime.

It is a super-2 number, since 2×21531424154211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21531424154011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1196190230781 + ... + 1196190230798.

It is an arithmetic number, because the mean of its divisors is an integer number (5183491000090).

Almost surely, 2^{21531424154211} is an apocalyptic number.

21531424154211 is a deficient number, since it is larger than the sum of its proper divisors (9569521846329).

21531424154211 is a wasteful number, since it uses less digits than its factorization.

21531424154211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392380461585 (or 2392380461582 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

Adding to 21531424154211 its reverse (11245142413512), we get a palindrome (32776566567723).

The spelling of 21531424154211 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred twenty-four million, one hundred fifty-four thousand, two hundred eleven".