21149094774 has 16 divisors (see below), whose sum is σ = 42331019760. Its totient is φ = 7044226560.

The previous prime is 21149094773. The next prime is 21149094781. The reversal of 21149094774 is 47749094112.

It is a super-2 number, since 2×21149094774² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149094773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1359547 + ... + 1375014.

It is an arithmetic number, because the mean of its divisors is an integer number (2645688735).

Almost surely, 2^21149094774 is an apocalyptic number.

21149094774 is an abundant number, since it is smaller than the sum of its proper divisors (21181924986).

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

21149094774 is a wasteful number, since it uses less digits than its factorization.

21149094774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735855.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 21149094774 in words is "twenty-one billion, one hundred forty-nine million, ninety-four thousand, seven hundred seventy-four".