15700421 has 8 divisors (see below), whose sum is σ = 17872704. Its totient is φ = 13652320.

The previous prime is 15700411. The next prime is 15700439. The reversal of 15700421 is 12400751.

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

It is a de Polignac number, because none of the positive numbers 2^k-15700421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15700393 and 15700402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15700411) 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, 30776 + ... + 31281.

It is an arithmetic number, because the mean of its divisors is an integer number (2234088).

Almost surely, 2^15700421 is an apocalyptic number.

15700421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15700421 is a deficient number, since it is larger than the sum of its proper divisors (2172283).

15700421 is a wasteful number, since it uses less digits than its factorization.

15700421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62091.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 15700421 is about 3962.3756762831. The cubic root of 15700421 is about 250.4015998581.

The spelling of 15700421 in words is "fifteen million, seven hundred thousand, four hundred twenty-one".