21409542294 has 32 divisors (see below), whose sum is σ = 48966441216. Its totient is φ = 6113219040.

The previous prime is 21409542289. The next prime is 21409542299. The reversal of 21409542294 is 49224590412.

It is an interprime number because it is at equal distance from previous prime (21409542289) and next prime (21409542299).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409542299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89152 + ... + 225315.

It is an arithmetic number, because the mean of its divisors is an integer number (1530201288).

Almost surely, 2^21409542294 is an apocalyptic number.

21409542294 is an abundant number, since it is smaller than the sum of its proper divisors (27556898922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21409542294 is a wasteful number, since it uses less digits than its factorization.

21409542294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316100.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21409542294 in words is "twenty-one billion, four hundred nine million, five hundred forty-two thousand, two hundred ninety-four".