21401609488 has 40 divisors (see below), whose sum is σ = 47691159872. Its totient is φ = 9113689728.

The previous prime is 21401609473. The next prime is 21401609521. The reversal of 21401609488 is 88490610412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590970 + ... + 626137.

Almost surely, 2^21401609488 is an apocalyptic number.

21401609488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21401609488 is an abundant number, since it is smaller than the sum of its proper divisors (26289550384).

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

21401609488 is a wasteful number, since it uses less digits than its factorization.

21401609488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217279 (or 1217273 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 21401609488 in words is "twenty-one billion, four hundred one million, six hundred nine thousand, four hundred eighty-eight".