21249999042 has 32 divisors (see below), whose sum is σ = 42669607680. Its totient is φ = 7055093760.

The previous prime is 21249999037. The next prime is 21249999047. The reversal of 21249999042 is 24099994212.

It is an interprime number because it is at equal distance from previous prime (21249999037) and next prime (21249999047).

It is not an unprimeable number, because it can be changed into a prime (21249999047) 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, 5850567 + ... + 5854197.

It is an arithmetic number, because the mean of its divisors is an integer number (1333425240).

Almost surely, 2^21249999042 is an apocalyptic number.

21249999042 is an abundant number, since it is smaller than the sum of its proper divisors (21419608638).

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

21249999042 is a wasteful number, since it uses less digits than its factorization.

21249999042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7258.

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 21249999042 in words is "twenty-one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, forty-two".