21146007651 has 32 divisors (see below), whose sum is σ = 31211619840. Its totient is φ = 12666576384.

The previous prime is 21146007647. The next prime is 21146007661. The reversal of 21146007651 is 15670064112.

It is not a de Polignac number, because 21146007651 - 2² = 21146007647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21146007661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 596245 + ... + 630713.

It is an arithmetic number, because the mean of its divisors is an integer number (975363120).

Almost surely, 2^21146007651 is an apocalyptic number.

21146007651 is a deficient number, since it is larger than the sum of its proper divisors (10065612189).

21146007651 is a wasteful number, since it uses less digits than its factorization.

21146007651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35035.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21146007651 in words is "twenty-one billion, one hundred forty-six million, seven thousand, six hundred fifty-one".