21621411422471 has 8 divisors (see below), whose sum is σ = 24722967832224. Its totient is φ = 18523050850080.

The previous prime is 21621411422411. The next prime is 21621411422489. The reversal of 21621411422471 is 17422411412612.

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

It is not a de Polignac number, because 21621411422471 - 2⁶ = 21621411422407 is a prime.

It is a super-3 number, since 3×21621411422471³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621411422411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798944840 + ... + 798971901.

It is an arithmetic number, because the mean of its divisors is an integer number (3090370979028).

Almost surely, 2^{21621411422471} is an apocalyptic number.

21621411422471 is a deficient number, since it is larger than the sum of its proper divisors (3101556409753).

21621411422471 is a wasteful number, since it uses less digits than its factorization.

21621411422471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597918681.

The product of its digits is 43008, while the sum is 38.

The spelling of 21621411422471 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, four hundred seventy-one".