21350491954 has 8 divisors (see below), whose sum is σ = 34937168688. Its totient is φ = 9704769060.

The previous prime is 21350491907. The next prime is 21350491979. The reversal of 21350491954 is 45919405312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21350491954.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485238432 + ... + 485238475.

It is an arithmetic number, because the mean of its divisors is an integer number (4367146086).

Almost surely, 2^21350491954 is an apocalyptic number.

21350491954 is a deficient number, since it is larger than the sum of its proper divisors (13586676734).

21350491954 is a wasteful number, since it uses less digits than its factorization.

21350491954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970476920.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 21350491954 in words is "twenty-one billion, three hundred fifty million, four hundred ninety-one thousand, nine hundred fifty-four".