21420762 has 16 divisors (see below), whose sum is σ = 46736352. Its totient is φ = 6491120.

The previous prime is 21420761. The next prime is 21420793. The reversal of 21420762 is 26702412.

It is not an unprimeable number, because it can be changed into a prime (21420761) 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, 162213 + ... + 162344.

It is an arithmetic number, because the mean of its divisors is an integer number (2921022).

Almost surely, 2^21420762 is an apocalyptic number.

21420762 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21420762 is an abundant number, since it is smaller than the sum of its proper divisors (25315590).

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

21420762 is a wasteful number, since it uses less digits than its factorization.

21420762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324573.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21420762 is about 4628.2569073032. The cubic root of 21420762 is about 277.7228661709.

The spelling of 21420762 in words is "twenty-one million, four hundred twenty thousand, seven hundred sixty-two".