21061400739 has 16 divisors (see below), whose sum is σ = 28875753120. Its totient is φ = 13644910080.

The previous prime is 21061400719. The next prime is 21061400749. The reversal of 21061400739 is 93700416012.

It is not a de Polignac number, because 21061400739 - 2⁸ = 21061400483 is a prime.

It is a super-2 number, since 2×21061400739² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21061400719) 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, 22422 + ... + 206459.

It is an arithmetic number, because the mean of its divisors is an integer number (1804734570).

Almost surely, 2^21061400739 is an apocalyptic number.

21061400739 is a deficient number, since it is larger than the sum of its proper divisors (7814352381).

21061400739 is a wasteful number, since it uses less digits than its factorization.

21061400739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229750.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 21061400739 in words is "twenty-one billion, sixty-one million, four hundred thousand, seven hundred thirty-nine".