21107442345 has 64 divisors (see below), whose sum is σ = 37510242048. Its totient is φ = 10048896000.

The previous prime is 21107442329. The next prime is 21107442353. The reversal of 21107442345 is 54324470112.

It is not a de Polignac number, because 21107442345 - 2⁴ = 21107442329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7376215 + ... + 7379075.

It is an arithmetic number, because the mean of its divisors is an integer number (586097532).

Almost surely, 2^21107442345 is an apocalyptic number.

It is an amenable number.

21107442345 is a deficient number, since it is larger than the sum of its proper divisors (16402799703).

21107442345 is a wasteful number, since it uses less digits than its factorization.

21107442345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674.

The product of its (nonzero) digits is 26880, while the sum is 33.

The spelling of 21107442345 in words is "twenty-one billion, one hundred seven million, four hundred forty-two thousand, three hundred forty-five".