21320774699490 has 576 divisors, whose sum is σ = 67503613731840. Its totient is φ = 4650016896000.

The previous prime is 21320774699453. The next prime is 21320774699507. The reversal of 21320774699490 is 9499647702312.

21320774699490 is a `hidden beast` number, since 2 + 1 + 32 + 0 + 77 + 46 + 9 + 9 + 490 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 3144189900 + ... + 3144196680.

It is an arithmetic number, because the mean of its divisors is an integer number (117193773840).

Almost surely, 2^{21320774699490} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320774699490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33751806865920).

21320774699490 is an abundant number, since it is smaller than the sum of its proper divisors (46182839032350).

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

21320774699490 is a wasteful number, since it uses less digits than its factorization.

21320774699490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159 (or 7149 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 63.

The spelling of 21320774699490 in words is "twenty-one trillion, three hundred twenty billion, seven hundred seventy-four million, six hundred ninety-nine thousand, four hundred ninety".