21357177330 has 64 divisors (see below), whose sum is σ = 52260225408. Its totient is φ = 5583951360.

The previous prime is 21357177253. The next prime is 21357177341. The reversal of 21357177330 is 3377175312.

It is a super-2 number, since 2×21357177330² (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 31 ways as a sum of consecutive naturals, for example, 2875782 + ... + 2883198.

It is an arithmetic number, because the mean of its divisors is an integer number (816566022).

Almost surely, 2^21357177330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21357177330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26130112704).

21357177330 is an abundant number, since it is smaller than the sum of its proper divisors (30903048078).

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

21357177330 is a wasteful number, since it uses less digits than its factorization.

21357177330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9291.

The product of its (nonzero) digits is 92610, while the sum is 39.

The spelling of 21357177330 in words is "twenty-one billion, three hundred fifty-seven million, one hundred seventy-seven thousand, three hundred thirty".