21001001094 has 24 divisors (see below), whose sum is σ = 45571876272. Its totient is φ = 6989609520.

The previous prime is 21001001053. The next prime is 21001001107. The reversal of 21001001094 is 49010010012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 881602 + ... + 905109.

It is an arithmetic number, because the mean of its divisors is an integer number (1898828178).

Almost surely, 2^21001001094 is an apocalyptic number.

21001001094 is an abundant number, since it is smaller than the sum of its proper divisors (24570875178).

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

21001001094 is a wasteful number, since it uses less digits than its factorization.

21001001094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787372 (or 1787369 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 21001001094 in words is "twenty-one billion, one million, one thousand, ninety-four".