21273870885951 has 8 divisors (see below), whose sum is σ = 28366087150384. Its totient is φ = 14182117606080.

The previous prime is 21273870885907. The next prime is 21273870886027. The reversal of 21273870885951 is 15958807837212.

It is a happy number.

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

It is not a de Polignac number, because 21273870885951 - 2⁶ = 21273870885887 is a prime.

It is a super-2 number, since 2×21273870885951² (a number of 27 digits) contains 22 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 (21273870185951) 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, 115638910 + ... + 115822731.

It is an arithmetic number, because the mean of its divisors is an integer number (3545760893798).

Almost surely, 2^{21273870885951} is an apocalyptic number.

21273870885951 is a deficient number, since it is larger than the sum of its proper divisors (7092216264433).

21273870885951 is a wasteful number, since it uses less digits than its factorization.

21273870885951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231492281.

The product of its (nonzero) digits is 67737600, while the sum is 66.

The spelling of 21273870885951 in words is "twenty-one trillion, two hundred seventy-three billion, eight hundred seventy million, eight hundred eighty-five thousand, nine hundred fifty-one".