20949338421 has 64 divisors (see below), whose sum is σ = 36091392000. Its totient is φ = 11875818240.

The previous prime is 20949338419. The next prime is 20949338539. The reversal of 20949338421 is 12483394902.

20949338421 is a `hidden beast` number, since 20 + 94 + 93 + 38 + 421 = 666.

It is not a de Polignac number, because 20949338421 - 2¹ = 20949338419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949338401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 422301 + ... + 469293.

It is an arithmetic number, because the mean of its divisors is an integer number (563928000).

Almost surely, 2^20949338421 is an apocalyptic number.

It is an amenable number.

20949338421 is a deficient number, since it is larger than the sum of its proper divisors (15142053579).

20949338421 is a wasteful number, since it uses less digits than its factorization.

20949338421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47111 (or 47105 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 20949338421 in words is "twenty billion, nine hundred forty-nine million, three hundred thirty-eight thousand, four hundred twenty-one".