21031415406 has 24 divisors (see below), whose sum is σ = 45758737440. Its totient is φ = 6981137856.

The previous prime is 21031415393. The next prime is 21031415407. The reversal of 21031415406 is 60451413012.

It is a happy number.

21031415406 is a `hidden beast` number, since 2 + 103 + 14 + 1 + 540 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21031415406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031415407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2440075 + ... + 2448678.

It is an arithmetic number, because the mean of its divisors is an integer number (1906614060).

Almost surely, 2^21031415406 is an apocalyptic number.

21031415406 is an abundant number, since it is smaller than the sum of its proper divisors (24727322034).

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

21031415406 is a wasteful number, since it uses less digits than its factorization.

21031415406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889000 (or 4888997 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21031415406 its reverse (60451413012), we get a palindrome (81482828418).

The spelling of 21031415406 in words is "twenty-one billion, thirty-one million, four hundred fifteen thousand, four hundred six".