21000431401 has 8 divisors (see below), whose sum is σ = 21690120704. Its totient is φ = 20311508160.

The previous prime is 21000431393. The next prime is 21000431411. The reversal of 21000431401 is 10413400012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000431401 - 2³ = 21000431393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000431411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135525 + ... + 245698.

It is an arithmetic number, because the mean of its divisors is an integer number (2711265088).

Almost surely, 2^21000431401 is an apocalyptic number.

It is an amenable number.

21000431401 is a deficient number, since it is larger than the sum of its proper divisors (689689303).

21000431401 is a wasteful number, since it uses less digits than its factorization.

21000431401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383031.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21000431401 its reverse (10413400012), we get a palindrome (31413831413).

The spelling of 21000431401 in words is "twenty-one billion, four hundred thirty-one thousand, four hundred one".