21430409192 has 8 divisors (see below), whose sum is σ = 40182017250. Its totient is φ = 10715204592.

The previous prime is 21430409171. The next prime is 21430409201. The reversal of 21430409192 is 29190403412.

It can be written as a sum of positive squares in only one way, i.e., 16634292676 + 4796116516 = 128974^2 + 69254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339400567 + ... + 1339400582.

Almost surely, 2^21430409192 is an apocalyptic number.

It is an amenable number.

21430409192 is a deficient number, since it is larger than the sum of its proper divisors (18751608058).

21430409192 is a wasteful number, since it uses less digits than its factorization.

21430409192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678801155 (or 2678801151 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21430409192 in words is "twenty-one billion, four hundred thirty million, four hundred nine thousand, one hundred ninety-two".