21131411397 has 16 divisors (see below), whose sum is σ = 28752907200. Its totient is φ = 13801352832.

The previous prime is 21131411381. The next prime is 21131411401. The reversal of 21131411397 is 79311413112.

It is not a de Polignac number, because 21131411397 - 2⁴ = 21131411381 is a prime.

It is a super-2 number, since 2×21131411397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131411347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291163 + ... + 356424.

It is an arithmetic number, because the mean of its divisors is an integer number (1797056700).

Almost surely, 2^21131411397 is an apocalyptic number.

It is an amenable number.

21131411397 is a deficient number, since it is larger than the sum of its proper divisors (7621495803).

21131411397 is a wasteful number, since it uses less digits than its factorization.

21131411397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647812.

The product of its digits is 4536, while the sum is 33.

The spelling of 21131411397 in words is "twenty-one billion, one hundred thirty-one million, four hundred eleven thousand, three hundred ninety-seven".