21621799470 has 32 divisors (see below), whose sum is σ = 51913531008. Its totient is φ = 5763456288.

The previous prime is 21621799429. The next prime is 21621799501. The reversal of 21621799470 is 7499712612.

It is a super-3 number, since 3×21621799470³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72064 + ... + 220083.

It is an arithmetic number, because the mean of its divisors is an integer number (1622297844).

Almost surely, 2^21621799470 is an apocalyptic number.

21621799470 is an abundant number, since it is smaller than the sum of its proper divisors (30291731538).

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

21621799470 is a wasteful number, since it uses less digits than its factorization.

21621799470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294624.

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 21621799470 in words is "twenty-one billion, six hundred twenty-one million, seven hundred ninety-nine thousand, four hundred seventy".