21949591830 has 16 divisors (see below), whose sum is σ = 52679020464. Its totient is φ = 5853224480.

The previous prime is 21949591801. The next prime is 21949591831. The reversal of 21949591830 is 3819594912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21949591831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365826501 + ... + 365826560.

It is an arithmetic number, because the mean of its divisors is an integer number (3292438779).

Almost surely, 2^21949591830 is an apocalyptic number.

21949591830 is an abundant number, since it is smaller than the sum of its proper divisors (30729428634).

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

21949591830 is a wasteful number, since it uses less digits than its factorization.

21949591830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731653071.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 21949591830 in words is "twenty-one billion, nine hundred forty-nine million, five hundred ninety-one thousand, eight hundred thirty".