21269147400 has 96 divisors (see below), whose sum is σ = 73260415200. Its totient is φ = 5671771200.

The previous prime is 21269147381. The next prime is 21269147401. The reversal of 21269147400 is 474196212.

It is a happy number.

21269147400 is a `hidden beast` number, since 2 + 126 + 91 + 47 + 400 = 666.

It is a super-3 number, since 3×21269147400³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21269147401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1963966 + ... + 1974765.

It is an arithmetic number, because the mean of its divisors is an integer number (763129325).

Almost surely, 2^21269147400 is an apocalyptic number.

21269147400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21269147400 is an abundant number, since it is smaller than the sum of its proper divisors (51991267800).

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

21269147400 is a wasteful number, since it uses less digits than its factorization.

21269147400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938756 (or 3938741 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 21269147400 in words is "twenty-one billion, two hundred sixty-nine million, one hundred forty-seven thousand, four hundred".