21620605211420 has 96 divisors (see below), whose sum is σ = 47982784389120. Its totient is φ = 8166541743360.

The previous prime is 21620605211411. The next prime is 21620605211449. The reversal of 21620605211420 is 2411250602612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351049949 + ... + 351111531.

It is an arithmetic number, because the mean of its divisors is an integer number (499820670720).

Almost surely, 2^{21620605211420} is an apocalyptic number.

21620605211420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21620605211420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23991392194560).

21620605211420 is an abundant number, since it is smaller than the sum of its proper divisors (26362179177700).

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

21620605211420 is a wasteful number, since it uses less digits than its factorization.

21620605211420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71355 (or 71353 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21620605211420 in words is "twenty-one trillion, six hundred twenty billion, six hundred five million, two hundred eleven thousand, four hundred twenty".