21976842394 has 16 divisors (see below), whose sum is σ = 36326660832. Its totient is φ = 9907270128.

The previous prime is 21976842373. The next prime is 21976842409. The reversal of 21976842394 is 49324867912.

It is a super-2 number, since 2×21976842394² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9827524 + ... + 9829759.

It is an arithmetic number, because the mean of its divisors is an integer number (2270416302).

Almost surely, 2^21976842394 is an apocalyptic number.

21976842394 is a deficient number, since it is larger than the sum of its proper divisors (14349818438).

21976842394 is a wasteful number, since it uses less digits than its factorization.

21976842394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19657341.

The product of its digits is 5225472, while the sum is 55.

The spelling of 21976842394 in words is "twenty-one billion, nine hundred seventy-six million, eight hundred forty-two thousand, three hundred ninety-four".