21890214470084 has 12 divisors (see below), whose sum is σ = 38738300888700. Its totient is φ = 10822128501888.

The previous prime is 21890214470071. The next prime is 21890214470227. The reversal of 21890214470084 is 48007441209812.

It can be written as a sum of positive squares in 2 ways, for example, as 4020385908100 + 17869828561984 = 2005090^2 + 4227272^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30744682889 + ... + 30744683600.

It is an arithmetic number, because the mean of its divisors is an integer number (3228191740725).

Almost surely, 2^{21890214470084} is an apocalyptic number.

It is an amenable number.

21890214470084 is a deficient number, since it is larger than the sum of its proper divisors (16848086418616).

21890214470084 is a wasteful number, since it uses less digits than its factorization.

21890214470084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61489366582 (or 61489366580 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

Adding to 21890214470084 its reverse (48007441209812), we get a palindrome (69897655679896).

The spelling of 21890214470084 in words is "twenty-one trillion, eight hundred ninety billion, two hundred fourteen million, four hundred seventy thousand, eighty-four".