21401012299 has 4 divisors (see below), whose sum is σ = 21402375264. Its totient is φ = 21399649336.

The previous prime is 21401012293. The next prime is 21401012333. The reversal of 21401012299 is 99221010412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21401012299 - 2³ = 21401012291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21401012299.

It is not an unprimeable number, because it can be changed into a prime (21401012291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657652 + ... + 689425.

It is an arithmetic number, because the mean of its divisors is an integer number (5350593816).

Almost surely, 2^21401012299 is an apocalyptic number.

21401012299 is a deficient number, since it is larger than the sum of its proper divisors (1362965).

21401012299 is a wasteful number, since it uses less digits than its factorization.

21401012299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362964.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 21401012299 in words is "twenty-one billion, four hundred one million, twelve thousand, two hundred ninety-nine".