21407232786 has 32 divisors (see below), whose sum is σ = 44466554880. Its totient is φ = 6865543056.

The previous prime is 21407232767. The next prime is 21407232787. The reversal of 21407232786 is 68723270412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21407232787) 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, 626686 + ... + 659961.

It is an arithmetic number, because the mean of its divisors is an integer number (1389579840).

Almost surely, 2^21407232786 is an apocalyptic number.

21407232786 is an abundant number, since it is smaller than the sum of its proper divisors (23059322094).

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

21407232786 is a wasteful number, since it uses less digits than its factorization.

21407232786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286758.

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 21407232786 in words is "twenty-one billion, four hundred seven million, two hundred thirty-two thousand, seven hundred eighty-six".