21424670172770 has 16 divisors (see below), whose sum is σ = 39808419418368. Its totient is φ = 8293420711920.

The previous prime is 21424670172767. The next prime is 21424670172809. The reversal of 21424670172770 is 7727107642412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34555919324 + ... + 34555919943.

It is an arithmetic number, because the mean of its divisors is an integer number (2488026213648).

Almost surely, 2^{21424670172770} is an apocalyptic number.

21424670172770 is a deficient number, since it is larger than the sum of its proper divisors (18383749245598).

21424670172770 is a wasteful number, since it uses less digits than its factorization.

21424670172770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69111839305.

The product of its (nonzero) digits is 1843968, while the sum is 50.

The spelling of 21424670172770 in words is "twenty-one trillion, four hundred twenty-four billion, six hundred seventy million, one hundred seventy-two thousand, seven hundred seventy".